• Mourad Ould-Slimane, Charles Latrobe, Paul Michelin, Nathalie Chastan, Franck Dujardin, Xavier Roussignol, and Rémi Gauthé.
• Department of Orthopedic Surgery, Spine Unit, Rouen University Hospital, Rouen, France; Normandie University, UNICAEN, INSERM, COMETE, Caen, France.
• World Neurosurg. 2017 Jun 1; 102: 425-433.

ObjectiveSpinal diseases often induce gait disorders with multifactorial origins such as lumbar pain, radicular pain, neurologic complications, or spinal deformities. However, radiography does not permit an analysis of spinal dynamics; therefore, sagittal balance dynamics during gait remain largely unexplored. This prospective and controlled pilot study assessed the Vicon system for detecting sagittal spinopelvic imbalance, to determine the correlations between optoelectronic and radiographic parameters.MethodsReversible anterior sagittal imbalance was induced in 24 healthy men using a thoracolumbar corset. Radiographic, optoelectronic, and comparative analyses were conducted.ResultsCorset wearing induced significant variations in radiographic parameters indicative of imbalance; the mean C7-tilt and d/D ratio increased by 15° ± 7.4° and 359%, respectively, whereas the mean spinosacral angle decreased by 16.8° ± 8° (all P < 0.001). The Vicon system detected the imbalance; the mean spinal angle increased by 15.4° ± 5.6° (P < 0.01), the mean floor projection of the C7S1 vector (C7'S1') increased by 126.3 ± 51.9 mm (P < 0.001), and the mean C7-T10-S1 angle decreased by 9.8° ± 3° (P < 0.001). Variations in C7'S1' were significantly correlated with d/D ratio (ρ = 0.58; P < 0.05) and C7-tilt (ρ = 0.636; P < 0.05) variations.ConclusionsCorset wearing induced radiographically confirmed anterior sagittal imbalance detected using the Vicon system. Optoelectronic C7'S1' correlated with radiographic C7-tilt and d/D ratio.Copyright © 2017 Elsevier Inc. All rights reserved.

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